Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 450mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-20
The AirTAC SAIJ125X450-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end position without swapping out the unit. The integrated adjustment screw provides a usable travel window of 430-450mm, letting you dial in the retract distance precisely during commissioning or product changeovers. Built with an extruded aluminum barrel and a SUS420J2 stainless steel rod, it delivers 6136N of pull force at 0.5 MPa.
This 125mm bore model is configured with PT tapered port threads and lacks a piston magnet, meaning position sensing via CMSE reed or DMSE electronic switches is not supported on this specific variant. The rear adjuster acts purely as a mechanical stop to set the travel end and deceleration point alongside the air cushions; it does not lock or hold the load without continuous live air pressure. For applications requiring position holding, a SAIL pneumatic lock or external rod lock is necessary.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×450 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-20 Is Used
Product Changeover
Dial in the 430-450mm travel window during format changes on packaging lines without replacing the cylinder or adding external stops.
End-Position Tuning
Fine-tune the retract stroke at commissioning to absorb mechanical variances and achieve precise positioning of heavy 125mm bore loads.
Heavy-Duty Conveying
Leverage 6136N of pull force at 0.5 MPa to push or pull heavy pallets, using the rear adjuster to set exact stop locations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-20 the Right Cylinder?
Select this 125mm bore cylinder when your application requires high thrust—delivering 6136N of pull force at 0.5 MPa—combined with a need for exact end-position tuning. If you need slightly less force, stepping down to an 80mm bore yields 2268N of pull force at 0.5 MPa. The adjustable stroke is ideal for variable end stops and machine setup changes, whereas a fixed-stroke SAI cylinder is better suited for applications with rigid, unchanging travel requirements. Because the stroke is 450mm, you must use an external guide to prevent excessive side loading on the rod and thread.
To ensure exact ISO 15552 dimensional interchangeability, match the 125mm bore, 450mm nominal stroke, 20mm adjustment range, PT G1/2 port threads, and the absence of a magnet. Note that the SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, intentionally omitting FB, CA, CB, and CR brackets. The rear stopper and air cushions only manage travel end deceleration, so never rely on them to hold a load; use a SAIL or BSAI cylinder for clamp-lock functionality.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-20 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of pull force and 8590N of push force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjusting screw acts as a mechanical stop that lets you trim the effective travel back by up to 20mm, creating a usable stroke window of 430-450mm. This allows for precise end-position tuning without swapping the cylinder, though it only stops the travel and does not lock the load.
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